Particular mailbox not being archived

Hello all,

EV version is  9.0.3.1164

We have a particular mailbox which stopped being archived about 6 months ago. There is nothing relevant in the event log about it (as I see it).

I have attached the Archiving Task report for this user, I didn't see an indication for a problem.

The thing is that when I run the archive job manually and choose this user it works as it should, but in the site scheduled nightly run it archives all mailboxes excpet this one.